Which of the following angles equals 2p radians?

1
Which of the following angles equals 2p radians?

1. 3600
2. 1800
3. 00
4. 3.140

Ans A
2
How would an angle in radians be converted to an
angle in degrees?

1. The angle in radians would be multiplied by
   1800/p
2. The angle in radians would be multiplied by
   3600/p
3. The angle in radians would be multiplied by
   1800/2p
4. The angle in radians would be multiplied by
   2p/3600

Ans A
3
At the Equator the Earth has a radius of 6380000
m and it rotates 3600 every 24 hours. What is
the angular displacement of a person standing at
the equator for 3 hours?

• 0.26 rad
• 0.52 rad
• 0.78 rad
• 0.39 rad

Ans C
4
A child sits on a carousel at a distance of 3.5 m
from the center and rotates through an arc length
of 6.5 m. What is the angular displacement of
the child?

1. 1.9 rad
2. 0.93 rad
3. 3.0 rad
4. 5.0 rad

Ans A
5
A ceiling fan initially at rest accelerates to a
final angular speed of 0.70 rad/s and rotates
through an angular displacement of 4.90 rad.
What is the ceiling fans average angular
acceleration?

• 0.10 rad/s2
• 0.05 rad/s2
• 1.80 rad/s2
• 0.60 rad/s2

Ans B
6
The end of the cord on a weed cutter is 0.15 m in
length. If the motor rotates at the rate of 126
rad/s, what is the tangential speed of the cord?

1. 628 m/s
2. 25 m/s
3. 19 m/s
4. 63 m/s

Ans C
7
A stone on the edge of a tire with a radius of
0.25 m has a centripetal acceleration of 4.0
m/s2. What is the tires angular speed?

• 1.0 rad/s
• 2.0 rad/s
• 3.2 rad/s
• 4.0 rad/s

Ans D
8
A 0.40 kg ball on a 0.50 m string rotates in a
circular path in a vertical plane. If a constant
angular speed of 8.0 rad/s is maintained, what is
the force that maintains circular motion when the
ball is at the top of the circle?

1. 9.0 N
2. 11 N
3. 13 N
4. 10.0 N

Ans C
9
The direction of an objects centripetal
acceleration while moving in uniform circular
motion is
Ans C

• a. Tangent to the circle
• b. Opposite to the direction of motion
• c. Toward the center of the circle
• d. Outward from the center of the circle

10
The direction of an objects linear speed while
moving in uniform circular motion is
Ans A

• a. Tangent to the circle
• b. Opposite to the direction of motion
• c. Toward the center of the circle
• d. Outward from the center of the circle

11
The direction of the force maintaining an
objects circular path is
Ans C

• a. Tangent to the circle
• b. Opposite to the direction of motion
• c. Toward the center of the circle
• d. Outward from the center of the circle